Chapter 1 - Force & Momentum

Question 0

What is meant by an inelastic collision?

Answer 0

When kinetic energy is not conserved, but momentum is conserved.

Question 1

Is kinetic energy conserved in an inelastic collision?

Answer 1

No

Question 2

Is momentum a scalar or vector quantity?

Answer 2

Vector

Question 4

Is the moment provided by a force a vector or scalar?

Answer 4

Vector

Question 5

What is the unit of impulse?

Answer 5

Ns

Question 6

What is the unit for the rate of change of momentum?

Answer 6

kgms^-2

Question 7

What is Change of Momentum?

Answer 7

Impulse

I = Ft = m(v-u)

Question 9

What is Newton’s Third(3rd) Law of Motion?

Answer 9

When two objects interact, they exert equal and opposite forces on each other

Question 10

What is the impact force of an elastic collision where the objects rebounds along the same line of motion

Answer 10

F = -2mu

t

Question 12

What is the Principle of Conservation of Momentum

Answer 12

When no external resultant forces act on a system the total momentum remains constant for interacting objects

Question 14

What is Newton’s First(1st) Law of Motion?

Answer 14

An object remains at rest, or in uniform motion unless acted on by an external force

Question 15

What is Newton’s Second(2nd) Law of Motion?

Answer 15

Rate of change of momentum is proportional to the resultant force

—> F = ma m(v-u)
t

Question 16

What type of collision causes an explosion?

Answer 16

Inelastic

Question 17

What is the unit Kinetic Energy?

Answer 17

Joules

Question 18

What is the area of a Force-Time graph?

Answer 18

Change of Momentum (Impulse)

Question 20

What happens when two objects collide?

Answer 20

They recoil from each other with equal and opposite amounts of momentum

Question 23

When is momentum conserved?

Answer 23

Momentum is always conserved

Question 27

What is an elastic collision?

Answer 27

When kinetic energy and momentum are both conserved

Question 36

What is the unit of momentum?

Answer 36

kgms^-1